Portion of a shoe upper



FIG. 1 is a front perspective view of a portion of a shoe upper showing my new design;

FIG. 2 is a rear perspective view thereof; and,

FIG. 3 is a side view of one side thereof.

The uneven broken line showing the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. The uneven broken line immediately adjacent to the shaded area represents an unclaimed boundary of the design. 

The ornamental design for a portion of a shoe upper, as shown and described. 